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Author Topic: Faster sync speeds on the way? Openreach to rollout 3dB target SNRm for FTTC  (Read 6283 times)

kitz

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Good news for those with stable Openreach FTTC lines which could see small increases in their sync speeds next year.
The current default target SNRM is 6dB but with effect from March 2017, the NGA DLM (Dynamic Line Management) may select 3, 4, 5 or 6dB depending upon how stable the line is.

We had been monitoring the Openreach trial of a 3dB Target SNRM on our forum which was undertaken in April earlier this year.  Those users who were on the trial saw their speeds increase and on the whole the trial appeared to be sucessful.

Based on our observations speed increases are roughly in line with the following figures.

~ For existing Sync speeds of around 20Mbps -  each 3dB is worth 3Mbps
~ For existing Sync speeds of around 40Mbps -  each 3dB is worth 6Mbps
~ For existing Sync speeds of 60Mbps or more - each 3dB is worth 11Mbps.

BT wholesale ADSL (copper) lines already have a 3dB profile available to them.  Obviously this increase wont make any difference if you are already syncing at the maximum speed ie 80Mbps or 40Mbps if you are on a 40/10 or 40/2 product.

For more information on BT's DLM see
What is Target SNR Margin
BT DLM system
BT DLM process

Credit to ejs for spotting the change in SIN 498 published Nov 2016
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kitz

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It may also be useful to add the speed projection graph done by S.Stephenson here.

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adslmax

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No benefit to my line because my line is sync at 79999/19999 but I just wish Openreach uncapped 80Meg to push faster sync rate speed as long your line support it. My line can get 115Meg but Openreach capped it at 80Meg for 2 years now, time to push uncapped.  >:(
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skyeci

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I suppose those of us on ECI with high ES lines may have to wait to see if G.INP does ever return next year and then possibly once thats applied we might then see new targets imposed if things settle down??
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Ronski

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If its the same as the trial there is no need for G.INP although it would help, I'm on an ECI cab and I'm sure I was on the trial for a while.
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Chrysalis

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a poor mans replacement to vectoring :) , is good news as it will work well alongside g.inp.

Hopefully ECI cabinets get g.inp next spring as well meaning us ECI users will benefit in the same way.

BT wont want lines flapping between different targets so it would be logical if the existing DLM colour codes are still used which if is the case then a line like mine in amber would not get a lower SNRM target, as it would require green, which is good as I would rather have a lower sync speed then a flapping line.  This is why g.inp is important as that would push most lines to green and would probably stay green at even 3db.
« Last Edit: November 15, 2016, 11:48:49 AM by Chrysalis »
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les-70

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  I would hope that G.inp made 3db viable for a lot of people but I don't think that we know what the ES rates for green/amber/red are with G.inp.  With interleaving the ES rate needs to be very much less than green to get back to fast path but  I don't think we know the exact criteria.
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AngelRex

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Can I assume this will also effect the upload?

Im on SKY FTTC 40/10 product with an (approximate) 800m line.

I currently get  40/6.5mb, with max att showing as 44/7

My SNR is 7.3 during the day, lowering to 6.8 at night on the DS and always around 6db on the US.


I realise that I am capped at 40mb and truth be told don't need more either way, just good to know.  Will there also be a possibility that the lower SNR will increase the ping times?  I used to be 7ms-9ms ping but this increased to 17ms.  IF anything I would rather a better ping! (Not that I could notice 10ms in gaming.....)

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jelv

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No benefit to my line because my line is sync at 79999/19999 but I just wish Openreach uncapped 80Meg to push faster sync rate speed as long your line support it. My line can get 115Meg but Openreach capped it at 80Meg for 2 years now, time to push uncapped.  >:(

How much extra would you be prepared to pay for the higher speed cap?
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michty_me

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This sounds good and hopefully bring me back up to what I was receiving two years ago when I was first connected.
I believe I was synching at bang on 74/20, This has reduced over time to 64.5/19.9 with SNR of 6.4/6. Hopefully I should gain my original speed back assuming I get switched. ES/hour are currently sitting at 0.09 with a weeks uptime since a firmware upgrade.
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adslmax

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Openreach will be extending their 'trial' of the variable dB and new DLM algorithm from Monday 16 January to select cabinets on the following exchanges (below).

A few points here though:

- ECI cabinets are excluded (I assume the new DLM is not fully tested/supported yet).
- Any line that has had the existing DLM intervene, due to poor performance, will be excluded from being moved over.
- Around 10% of lines are expected to move to the new XdB and DLM algo.

Ashburton
Ashcott
Ashreigney
Ashwater
Axbridge
Axminster
Baltonsborough
Bampton, Devon
Banwell
Barnstaple
Bath Kingsmead
Batheaston
Beaford
Beaworthy
Beckington
Bere Alston
Bickington
Bickleigh
Bideford
Bigbury-On-Sea
Bishops Lydeard
Bishops Nympton
Black Torrington
Blackawton
Blagdon
Blagdon Hill
Bleadon
Bovey Tracey
Bow
Box
Bradford -On-Avon
Bradford- On-Tone
Bradworthy
Branscombe
Bratton Clovelly
Braunton
Brayford
Brean Down
Brent Knoll
Bridestowe
Bridgerule
Bridgwater
Bristol West
Brixham
Broadhembury
Bruton
Buckfastleigh
Buckland St.Mary
Budleigh Salterton
Burnham-On-Sea
Burrowbridge
Castle Cary
Chagford
Chapmanslade
Chard
Charlton Mackrell
Cheddar
Chelston
Cheriton Bishop
Cheriton Fitzpaine
Chew Magna
Chewton Mendip
Chillaton
Chilton Polden
Chiselborough
Chittlehamholt
Chudleigh
Chulmleigh
Churchill
Churston
Clevedon
Clovelly
Colaton Raleigh
Colyton
Combe Down
Combe Martin
Combwich
Compton Dando
Copplestone
Cornwood
Corscombe
Corton Denham
Craddock
Cranmore
Crediton
Crewkerne
Crowcombe
Crownhill
Croyde
Cullompton
Dartmouth
Dawlish
Devonport
Ditcheat
Dittisham
Dolton
Drewsteignton
Dulverton
Dunster
East Allington
Edingworth
Evercreech
Exbourne
Exeter
Exeter Exminster
Exford
Exmouth
Faulkland
Feniton
Flax Bourton
Frogmore
Frome
Gara Bridge
Glastonbury
Harbertonford
Hartland
Hatch Beauchamp
Hatherleigh
Hawkchurch
Haytor
Hele
Hemyock
Henlade
High Bickington
Holbeton
Holford
Holsworthy
Honiton
Horns Cross
Ilchester
Ilfracombe
Ilminster
Instow
Ipplepen
Isle Brewers
Ivybridge
Kennford
Kentisbeare
Kingsbridge
Kingskerswell
Kingston St Mary
Kingswear
Langport
Langtree
Lapford
Launceston
Lewdown
Lifton
Limpley Stoke
Loddiswell
Long Ashton
Long Sutton, Somerset
Longdown
Lulsgate
Luppitt
Lustleigh
Lydeard St.Lawrence
Lydford
Lyme Regis
Lynton
Maiden Bradley
Manaton
Mark Moor
Marston Magna
Martock
Meare Heath
Mells
Midsomer Norton
Milborne Port
Milverton
Minehead
Modbury
Morchard Bishop
Moretonhampstead
Nailsea
Nether Stowey
Newton Abbot
Newton Ferrers
Newton St.Cyres
Newton Tracey
North Cadbury
North Curry
North Molton
North Petherton
North Tawton
Nunney
Oakford
Oakhill
Okehampton
Ottery St.Mary
Paignton
Pill
Pilton
Pinhoe
Plymouth
Plymstock
Porlock
Portishead
Priddy
Princetown
Puriton
Radstock
Roborough
Salcombe
Saltford
Sampford Peverell
Seaton
Shaldon
Shaugh Prior
Shebbear
Shepton Mallet
Shiphay Collaton
Shirwell
Sidbury
Sidmouth
Silverton
Somerton
South Brent
South Chard
South Molton
South Petherton
Sowton
Spaxton
St. Budeaux
St. Marychurch
Stalbridge
Starcross
Staverton
Stockland
Stogumber
Stoke Canon
Stoke Fleming
Stoke Gabriel
Stratton On The Fosse
Street
Stroud
Sutton Cross
Swimbridge
Taunton
Tavistock
Tedburn St.Mary
Teignmouth
Temple Cloud
Templecombe
Timberscombe
Timsbury
Tiverton
Topsham
Torcross
Torquay
Torrington
Totnes
Trowbridge
Washford
Wedmore
Wellington
Wells
Wembury
West Coker
West Harptree
Weston Super Mare
Weston Zoyland
Whiddon Down
Whimple
Widecombe -In-The-Moor
Williton
Wincanton
Winkleigh
Winscombe
Winsford, Somerset
Witheridge
Wiveliscombe
Woodbury
Woolacombe
Worle
Wrington
Yatton
Yealmpton
Yelverton
Yeovil
Yetminster

Thanks to AndyHCZ for a copy from Openreach
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skyeci

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Nice to see my home town of frome on the list for once. But Shame the majority of my towns cabs are on eci ... :-\
« Last Edit: January 12, 2017, 03:54:57 PM by skyeci »
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jaydub

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With odd exceptions, they aren't exactly rolling it out to major demographic areas (e.g. the M-i-L's Devon village is on the list.)

My knowledge of the South West isn't great, but are they all Avon, Somerset, Devon and Cornwall exchanges?
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skyeci

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Yeah.  You are  correct. Perhaps g.inp needs to resolved on eci first if this will ever happen.

Wiltshire too with Trowbridge..
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Chrysalis

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its logical g.inp would be a requirement, as they dont want to risk higher fault calls.  3db without g.inp will be risky on that.
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